Video Caption: NASA’s Commercial Crew Program is four years old and continues to build momentum toward space. After beginning with artist concepts and designs, spacecraft developers now are testing full-size models and taking steps to qualify sub-systems. The agency’s astronauts are practicing launches and landings in simulators to iron out the details in critical software. The Commercial Crew Program’s progress so far is the result of diligent and relentless efforts to reshape America’s human spaceflight program. Spacecraft developed by Commercial Crew Program partners will be the safest, most reliable and cost-effective transportation systems to and from low-Earth orbit and the International Space Station. NASA and the Commercial Crew Program stand on a path leading to launch from American soil in 2017.